File:Einstein revisited.jpg
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摘要
描述Einstein revisited.jpg |
English: A century ago, Albert Einstein published his famous theory of relativity. He proposed that all objects physically warp the fabric of space, with larger masses producing a more pronounced effect, and very massive objects (such as the Sun) causing light to travel along curved paths through space. Such an effect was first observed during the 1919 solar eclipse by English astronomer Arthur Eddington.
Researchers had to wait a century, however, to get a telescope powerful enough to detect this gravitational microlensing caused by a star outside the Solar System. Even around objects with very large masses, such as stars, this effect is very slight, making such detections extremely challenging for ground-based telescopes. It is, however, within the capabilities of the NASA/ESA Hubble Space Telescope, which gathered the data comprising this Picture of the Week. The bright star in the centre of the image is the nearby white dwarf Stein 2051B, only 17 light-years from Earth. The smaller star below is about 5000 light-years away. Astronomers observed Stein 2051B eight times within two years while the white dwarf travelled in front of of the distant background star. During the close alignment, the white dwarf’s gravity bent the light from the distant star, making it appear offset by about 2 milliarcseconds from its actual position. This deviation is so small that it is equivalent to observing an ant crawl across the surface of a 1€ coin from 2300 kilometres away. |
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來源 | https://www.spacetelescope.org/images/potw1724a/ |
作者 | NASA, ESA, and K. Sahu (STScI) |
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ESA/Hubble images, videos and web texts are released by the ESA under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee provided they are clearly and visibly credited. Detailed conditions are below; see the ESA copyright statement for full information. For images created by NASA or on the hubblesite.org website, or for ESA/Hubble images on the esahubble.org site before 2009, use the {{PD-Hubble}} tag.
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12 6 2017
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日期/時間 | 縮圖 | 尺寸 | 用戶 | 備註 | |
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目前 | 2017年6月12日 (一) 15:09 | 1,200 × 900(156 KB) | Jmencisom | User created page with UploadWizard |
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製作/提供者 | NASA, ESA, and K. Sahu (STScI) |
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來源 | ESA/Hubble |
簡稱 |
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影像標題 |
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使用條款 |
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資料產生的日期時間 | 2017年6月12日 (一) 06:00 |
使用軟體 | Adobe Photoshop CC 2017 (Macintosh) |
檔案修改日期時間 | 2017年5月23日 (二) 14:01 |
數位化的日期時間 | 2016年9月21日 (三) 05:46 |
詮釋資料最後修改日期 | 2017年5月23日 (二) 10:01 |
原始文件唯一識別碼 | xmp.did:9e255b6a-a439-41b3-af6f-2d32293a546c |
關鍵字 | Stein 2051 |
聯絡資訊 |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
IIM 版本 | 4 |
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